Tappet-valve silencer



C. H. STROHL.

TAPPET VALVE SILENCER.

APPLICATION FILED LULY 19.1920.

1,410,77 1. Patented Mar. 28, 1922.

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" rAPrEnvALvE s'ILENoER.

' Application filedflfuly 19,

To aZZ whoa/"tit may concern) Beit known that I, CARL flfi'rnoinl, acitizen of the United States; and resident of Fremont, in the county of 'Sandusky and State of Ohio, have-made-an Invention Appertaining to Tappet valve Silencers; and I do hereby declare that the following is a full, clear, and exact description of the invention, suchas'will enable others skilled in't'hea-rt to which it appe'r'tains-to make and use the 'same',reference b'eing'lia'd to the ac- -companying drawings,- and to the characters of reference marked there0n,-whiclr form a part ofthis specification. I 1 5 This invention relates to a silencer for tappet valves and particularly to those of the type used in connection 'wit-h valve-in tlie-head'motorsi The object of the invention is the provision of a silencing means of the character described which is simple andinexpensive in its construction, capable of being easily and quickly applied to a motor, and which is highly efficient in its operation.

The invention is fully described in the following specification, and While, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

Figure l is a top fragmentary view of a motor with a valve operating means thereof equipped with my silencer. Fig. 2 is a fragmentary side elevation thereof, and Fig. 3 is a perspective view of the silencer removed from the engine.

Referring to the drawings, 1 designates the casing of an internal combustion motor, 2 a valve-stem projecting upward through the head thereof, 3 acoiled compression spring for normallymaintaining the valve seated and having one end thrust against the casing and its other end thrust against a shoulder or collar 4; on the stem, held in position thereon by a pin 5. The customary cam operated tappet-rod 6 is disposed at a side of the casing, and valve opening move ments are communicated from this rod to the valve stem through a tappet-lever 7, as well understood in the art, such lever being fulcrumed intermediate its ends toa standard 8 rising from the casing.

The silencing means embodying the mvention is designated 9 and comprises a spring wire looped centrally upon itself in Specification ct Lette'r sjlatent.

Patented- Mar. 28, 19122. 1920: Serial No. 397,201.

the manner of a hairpin and having the loopedend portion 10, the leg portions 11 extending normally at subst'al'itially a right angle therefrom, the terminal leg portions IQeXtending normally at substantially right angles'from the leg portions 11 in the general direction of the looped portion 10 and connected to the leg portions 11 through coils 13, as best shown in Fig; 3;

i In applying the silencer spring to a motor it is placed in straddling relation to the valve-stem engaging arm of the ta13 pet-lever T with its looped portion 10 engaged under the arm adjacent to the outer end thereof and with the legs of such looped portion, in the present instance, extending cross-wise of the arm substantially to its top edge. leg portions 11 then extend lengthwise of the upper end portion of the lever-arm toward its fulcrum, with the coils 13 disposed at each side of the arm near its inner end. The leg portions 12 extend forward toward the valve stem and bear downward at their ends on the collar or shoulder 14, the spring 9 being placed under tension in this arrangement by reason of the leg portions 11 and 12 being drawn from normal position toward each other, as shown. It is evident that the spring 9 exerts a continual pressure on the tappet-lever to prevent any rattling or clattering thereof if its mounting becomes loose or if play occurs between the lever and either the tappet-rod or valve stem, or both.

It is preferable to position a pressureplate 1.4 over the shoulder or collar 4 to receive the thrust of the spring legs 12, such plate being of substantially U-form to adapt it to be placed in straddling relation with the valve stem 2 between the collar 4 and pin 5. The plate 14c is provided at opposite sides of its slot 15 with perforations 16 with which the oppositely turned end portions 17 of the spring legs 12 are adapted to have hooked en agements.

.t is found in practice that my invention provides a simple and inexpensive means for effectively preventing the objectionable clattering of loose parts of tappet-valve operating means of the valve-in-the-head type, and that the silencer springs may be easily and quickly attached without dismantling any of the parts of the motor.

wish it understood that my invention is not limited to any s ecific construction, arrangment or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims: e

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is,

1. The combination with a motor tappetlever and valvesstem, of a thrust member mounted on the stem, and a spring carried by the lever and having fingers in hooked engagement with the thrust member to retain it in engagement with thestem and to cooperate therewith to exert, a tension be tween the thrust member and tappet-lever.

2. In a motor, the combination of a tappet-lever, a valve stem operated by movements oli the lever, a spring acting on the stem to normally retain it in one position, a slotted thrust plate straddling the stem between the spring and tappet lever, and a silencer spring carried by the lever and having legs projecting outwardly therefrom in engagement with the thrust plate to retain it mounted on the stem and to exert a tension between the thrust plate and tappetlever.

3. A. silencer means 01' the class described,

comprising a spring wire looped on itself with the legs thereof coiled intermediate their ends and with the outer portions angled with respect to the inner portions thereof and having laterally bent end terminals, and a thrust plate for mounting on a valve stem and having perforations for receiving the laterally bent end terminals of the spring.

at. The combination with the tappet-lever and valve-stem of a valve-in-the-head motor, the valve stem having a spring thrust collar and a stop pin for the collar, of a silencer spring looped on itself under the valve stem engaging arm of the tappet lever, with its legs extending inward a distance along opposite sides of the lever then coiled and having their outer end portions extending outward toward the valve-stem and terminating in laterally extending end spurs, a thrust plate mounted on the valve-stem betweenits collar and stop pin and having perforations with which the end spurs of the silencer spring engage, the silencer spring exerting aten-V sion between the valve-stem collar and tappet lever. I v

In testimony whereof I have hereunto signed my name to this specification.

CARL STROHL. 

